CN104833720B - The method of single coil electromagnetism Resonance detector metallic conduit damage - Google Patents
The method of single coil electromagnetism Resonance detector metallic conduit damage Download PDFInfo
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- CN104833720B CN104833720B CN201510201283.0A CN201510201283A CN104833720B CN 104833720 B CN104833720 B CN 104833720B CN 201510201283 A CN201510201283 A CN 201510201283A CN 104833720 B CN104833720 B CN 104833720B
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Abstract
The present invention proposes a kind of method of single coil electromagnetism Resonance detector metallic conduit damage, by detection coil and electric capacity composition LC resonance circuits in parallel, pass through the change of detection coil inductance value come the type of qualitative and quantitative analysis pipe damage, position, depth and width.The method of the present invention is still effective for non-ferromagnetic metal pipeline, ensures the popularity of the scope of application；Detection coil can use non-contact detection, go for the adverse circumstances such as dust, dirt, greasy dirt；For detecting system using single coil as sensor, detecting system is simple in construction, and cost is cheap；Overcome in current metallic conduit damage check, detecting system is complicated, data handling procedure is cumbersome, it is undesirable to axial crack Detection results the problems such as.
Description
Technical field
The invention belongs to field of non destructive testing, more particularly to a kind of method for detecting metallic conduit damage.
Background technology
The method that metallic conduit damage check mainly uses at present has：Flux-leakage detection method, generally ferromagnetic pipeline is entered
The problem of row excitation, being detected, being existed to pipe damage by the magnetic leakage signal for detecting pipeline is only for ferromagnetic pipeline
Effectively, and the damage of pipeline axial crack is needed to design special excitation structure and could obtains comparatively ideal testing result.Tradition
Eddy current detection method, be generally made up of transducer, excitation coil, detection coil, signal conditioning circuit etc., needed in detection process
Larger exciting signal source is wanted, and detection signal obtains, analyzing and processing process is complex.
The problem of all being existed using Magnetic Flux Leakage Inspecting or EDDY CURRENT in current techniques is that whole detecting system compares
It is complicated, it is difficult to reach portable on-line checking and apply well, it is unsatisfactory simultaneously for axial crack Detection results, it is necessary to rationally
Design detecting system can be only achieved preferable Detection results.
The content of the invention
In order to solve problem in the prior art, the present invention proposes a kind of using single coil electromagnetism Resonance detector metal tube
The method of road damage, by the change of detection coil inductance value come the type of qualitative and quantitative analysis pipe damage, position, depth
And width.The method of the present invention is still effective for non-ferromagnetic metal pipeline, ensures the popularity of the scope of application；Detection coil
Non-contact detection can be used, goes for the adverse circumstances such as dust, dirt, greasy dirt；Detecting system using single coil as
Sensor, detecting system is simple in construction, and cost is cheap；Overcome in current metallic conduit damage check, detecting system is complicated,
Data handling procedure is cumbersome, it is undesirable to axial crack Detection results the problems such as.
The present invention is achieved through the following technical solutions：
A kind of method of single coil electromagnetism Resonance detector metallic conduit damage, applied to using single coil electromagnetism resonance
The detecting system of metallic conduit damage is detected, the system includes detection coil, electric capacity, EMR electromagnetic resonance measuring circuit, signal transmission
Circuit and damage alarming or signal show analysing terminal；The pipeline passes through the coil of coiling, by the coil and electric capacity
Parallel connection forms LC resonance circuits, the inductance value of the detection coil in LC resonance circuits described in the inductance resonance measurement electric circuit inspection
Change, the inductance value changes are transferred to damage alarming by the signal circuit or signal shows analysing terminal, institute
Stating method includes the detection process of qualitative detection pipe damage：
Step101：One section of metallic conduit to be detected is passed through into detection coil, while tentatively surveyed using inductance measurement instrument
Measure the inductance value through detection coil during metallic conduit；
step102：Metal tube is passed through according to the resonant frequency of inductance resonance measurement circuit and resonance impedance and preliminary surveying
The inductance value calculation matching shunt capacitance of detection coil during road；
step103：Detection coil and one section of intact metallic conduit are relatively moved, obtains the inductance change of detection coil,
To being demarcated through the inductance of detection coil during intact metallic conduit；
step104：Pipe damage is detected, relatively moves detection coil and metallic conduit to be detected, obtains detection coil
Inductance change, for beyond demarcation threshold value inductance value think pipeline exist damage.
Further, methods described also includes the detection process for quantitatively detecting pipe damage：
Step201：One section of metallic conduit to be detected is passed through into detection coil, while tentatively surveyed using inductance measurement instrument
Measure the inductance value through detection coil during metallic conduit；
step202：Metal tube is passed through according to the resonant frequency of inductance resonance measurement circuit and resonance impedance and preliminary surveying
The inductance value calculation matching shunt capacitance of detection coil during road；
step203：The damage of series of standards is made, by the way of equal interval sampling or pipeline at the uniform velocity passes through detection
Sample detecting coil inductance when during coil etc., the coil inductance of standard damage is demarcated；
step204：Sample detecting coil inductance when when at the uniform velocity passing through detection coil using equal interval sampling or pipeline etc.,
Treat detection pipeline to be detected, for the demarcation signal size in the signal combination step203 of threshold value, detection is obtained
Inductance signal analyzed, calculate the equivalent depth and width of pipe damage.
Further, the detection coil is coiling or PCB coil.
Further, when matching is less than corresponding electric capacity, series inductance is to increase the detection coil inductance value.
Further, the standard damage includes various sizes of axial crack, hole and abrasion.
The beneficial effects of the invention are as follows：（1）Cleaning Principle changes for the inductance of detection coil, for non-ferromagnetic metal pipe
Road is still effective, ensures the popularity of the scope of application；（2）Detection coil can use non-contact detection, go for powder
The adverse circumstances such as dirt, dirt, greasy dirt；（3）For detecting system using single coil as sensor, detecting system is simple in construction, and cost is low
It is honest and clean；（4）Metallic conduit passes through detection coil, and axial crack, hole and abrasion have larger change to detection coil inductance value, inspection
Surveying signal has higher signal to noise ratio；（5）Data signal, testing number are converted into by inductance value is detected by inductance resonance measurement circuit
Analyzed according to transmission over long distances and storage is easy to；（6）Inductance resonance measurement circuit response time is short, it is possible to achieve quick online detection
Metallic conduit damages；Some is mainly overcome in current metallic conduit damage check above, and detecting system is complicated, data processing
Process is cumbersome, it is undesirable to axial crack Detection results the problems such as.
Brief description of the drawings
Fig. 1 is the system schematic using single coil electromagnetism Resonance detector pipe damage of the present invention；
Fig. 2 is different type, the detection coil inductance value changes waveform diagram corresponding to various sizes of damage.
Embodiment
The present invention is further described for explanation and embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1 be the present invention the detecting system using single coil electromagnetism Resonance detector pipe damage, should
System includes detection coil, electric capacity, EMR electromagnetic resonance measuring circuit, signal circuit and damage alarming or signal display analysis eventually
End.By detection coil and electric capacity composition LC resonance circuits in parallel.Wherein, detection coil is coiling or PCB coil, its number of turn
The inductance value of detection coil determines when passing through detection coil according to pipeline to be checked；The capacitance of shunt capacitance also will be according to detection coil
Inductance value and inductance resonance measurement circuit resonant determine；Inductance resonance measurement circuit is humorous by LC
The circuit of the inductance value of vibration frequency detection LC resonance circuits；Signal circuit is the signal coordinated with inductance resonance measurement circuit
Output circuit, inductance signal is transferred to damage alarming or signal shows the terminal of analysis；Damage alarming terminal primarily directed to
Qualitative detection, design and threshold test is carried out according to the inductance signal of output, for the signal beyond threshold value（In the presence of damage）Carry out
Alarm.Signal analysis display terminal is for quantitative detection, and display and quantitative analysis are carried out to quantify for the inductance value of detection
Calculate the size of damage（Axial crack, hole and the size of abrasion）.
The principle of the detecting system detection metallic conduit damage of the present invention is that metallic conduit is passed through to the multiturn coil of coiling
Or PCB coil, by coil and suitable electric capacity composition LC resonance circuits in parallel.During detection, pipeline and detection coil relative motion,
Realize that metallic conduit damages by the inductance value changes of the detection coil in inductance resonance measurement electric circuit inspection LC resonance circuits
Detection.When relatively moving detection coil with pipeline, damaged when metallic conduit is present（Particularly axial crack, hole and abrasion）
When, the inductance value for the detection coil being wound on metallic conduit changes, and can now be determined by the inductance value of detection coil
Property detection steel pipe with the presence or absence of damage.If at the uniform velocity pass through detection coil using equal interval sampling or metallic conduit, Ke Yiding
The axial length and depth of defect of amount detection pipe damage.
The detection process of qualitative detection pipe damage of the present invention is as follows：
Step101：One section of metallic conduit to be detected is passed through into detection coil, while tentatively surveyed using inductance measurement instrument
Measure the inductance value through detection coil during metallic conduit；
step102：Metal tube is passed through according to the resonant frequency of inductance resonance measurement circuit and resonance impedance and preliminary surveying
The inductance value calculation matching shunt capacitance of detection coil during road, can be with series inductance to increase when matching is less than corresponding electric capacity
Big coil inductance；
step103：One section of intact metallic conduit is selected, relatively moves detection coil and metallic conduit, obtains detection coil
Inductance change, to being demarcated through the inductance of detection coil during intact metallic conduit；
step104：Pipe damage is detected, relatively moves detection coil and metallic conduit, the inductance for obtaining detection coil becomes
Change, for thinking that pipeline has damage beyond the inductance value of demarcation threshold value；
The detection process that the present invention quantitatively detects pipe damage is as follows：
Step201：With above-mentioned qualitative detection step101 processes；
step202：With above-mentioned qualitative detection step102 processes；
step203：Make the damage of series of standards（Various sizes of axial crack, hole and abrasion）, using etc. between
Sample detecting coil inductance when when the mode or pipeline of sampling at the uniform velocity passing through detection coil etc., to the coil of standard damage
Inductance value is demarcated；
step204：Sample detecting coil inductance when when at the uniform velocity passing through detection coil using equal interval sampling or pipeline etc.,
Treat detection pipeline to be detected, for the demarcation signal size in the signal combination step203 of threshold value, detection is obtained
Inductance signal analyzed, calculate the equivalent depth and width of pipe damage.
As shown in Figure 2, different type, the corresponding detection coil inductance value changes of various sizes of damage are different, sample institute
The inductance value waveform obtained is also different.
The beneficial effects of the invention are as follows：（1）Cleaning Principle changes for the inductance of detection coil, for non-ferromagnetic metal pipe
Road is still effective, ensures the popularity of the scope of application；（2）Detection coil can use non-contact detection, be applicable not only to just
Normal working environment, it may be equally applicable for the adverse circumstances such as dust, dirt, greasy dirt；（3）Detecting system is using single coil as sensing
Device, detecting system is simple in construction, and cost is cheap；（4）Metallic conduit passes through detection coil, and axial crack, hole and abrasion are to inspection
Test coil inductance value has larger change, and detection signal has higher signal to noise ratio；（5）It will be detected by inductance resonance measurement circuit
Inductance value is converted into data signal, and detection data are easy to transmit over long distances and storage analysis；（6）Inductance resonance measurement circuit responds
Time is short, it is possible to achieve quick online detection metallic conduit damages；Some mainly overcomes current metallic conduit damage check above
In, detecting system is complicated, data handling procedure is cumbersome, it is undesirable to axial crack Detection results the problems such as.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (9)
1. a kind of method of single coil electromagnetism Resonance detector metallic conduit damage, is examined applied to using single coil electromagnetism resonance
Survey pipe damage detecting system, the system include detection coil, electric capacity, inductance resonance measurement circuit, signal circuit and
Damage alarming terminal or signal show analysing terminal；The pipeline passes through the detection coil of coiling, by the detection coil
With electric capacity is in parallel forms LC resonance circuits, the detection coil in LC resonance circuits described in the inductance resonance measurement electric circuit inspection
Inductance value changes, the inductance value changes are transferred to damage alarming or signal display analysis eventually by the signal circuit
End, methods described include the detection process of qualitative detection pipe damage：
Step101：One section of metallic conduit to be detected is passed through into detection coil, while worn using inductance measurement instrument preliminary surveying
The inductance value of detection coil when crossing metallic conduit；
step102：When passing through metallic conduit according to the resonant frequency of inductance resonance measurement circuit and resonance impedance and preliminary surveying
The inductance value calculation matching shunt capacitance of detection coil；
step103：Detection coil and one section of intact metallic conduit are relatively moved, the inductance change of detection coil is obtained, to wearing
The inductance of detection coil is demarcated when crossing intact metallic conduit；
step104：Pipe damage is detected, relatively moves detection coil and metallic conduit to be detected, obtains the electricity of detection coil
Sense change, for thinking that pipeline has damage beyond the inductance value of demarcation threshold value.
2. according to the method for claim 1, it is characterised in that：Methods described also includes the detection for quantitatively detecting pipe damage
Process：
Step201：One section of metallic conduit to be detected is passed through into detection coil, while worn using inductance measurement instrument preliminary surveying
The inductance value of detection coil when crossing metallic conduit；
step202：When passing through metallic conduit according to the resonant frequency of inductance resonance measurement circuit and resonance impedance and preliminary surveying
The inductance value calculation matching shunt capacitance of detection coil；
step203：Series of standards damage is made, is adopted when when at the uniform velocity passing through detection coil using equal interval sampling or pipeline etc.
Sample detection coil inductance, the detection coil inductance value of standard damage is demarcated；
step204：Sample detecting coil inductance when when at the uniform velocity passing through detection coil using equal interval sampling or pipeline etc., is treated
Detection pipeline is detected, for the demarcation signal size in the signal combination step203 of threshold value, the electricity obtained to detection
Sense signal is analyzed, and calculates the equivalent depth and width of pipe damage.
3. according to the method for claim 1, it is characterised in that：The detection coil is coiling or PCB coil.
4. method according to claim 1 or 2, it is characterised in that：When matching less than corresponding electric capacity when, series inductance with
Increase the inductance value of LC resonance circuits.
5. according to the method for claim 2, it is characterised in that：Standard damage include various sizes of axial crack,
Hole and abrasion.
6. according to the method for claim 1, it is characterised in that：The process of the qualitative detection pipe damage is by the damage
Alarm terminal performs.
7. according to the method for claim 2, it is characterised in that：The process of pipe damage that quantitatively detects is by the signal
Show that analysing terminal performs.
8. according to the method for claim 1, it is characterised in that：Methods described is applied to magnetic conductive material or non-magnetic material
The metallic conduit of material.
9. according to the method for claim 1, it is characterised in that：Methods described is applied to following adverse circumstances：Dust, dirt
Dirt, greasy dirt.
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| CN105823493A (en) * | 2016-03-11 | 2016-08-03 | 上海交通大学 | Sensitivity enhancement type eddy current transducer |
| CN108827543B (en) * | 2018-04-25 | 2019-11-15 | 哈尔滨工业大学 | In a kind of simulation soil at feedwater piping crack leakage loss situation device |
| CN110568064A (en) * | 2019-10-15 | 2019-12-13 | 厦门大学 | Resonant eddy current detection method and system for damage of carbon fiber composite material |
| CN110653176A (en) * | 2019-10-30 | 2020-01-07 | 爱德森（厦门）电子有限公司 | Discontinuous online dynamic electromagnetic sorting method for non-metal parts |
| CN111272494B (en) * | 2020-03-05 | 2020-10-27 | 付君义 | Highway pitch harmful gas collection device under high temperature environment |
| CN215956394U (en) * | 2021-10-22 | 2022-03-04 | 深圳飞骧科技股份有限公司 | SMD debugger |
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